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authorAlexei Starovoitov <ast@fb.com>2016-05-05 19:49:12 -0700
committerDavid S. Miller <davem@davemloft.net>2016-05-06 16:01:54 -0400
commitdb58ba45920255e967cc1d62a430cebd634b5046 (patch)
tree6249362f507db4d022929e61069ca3742ab569ef /Documentation/networking/filter.txt
parentbpf: improve verifier state equivalence (diff)
downloadlinux-dev-db58ba45920255e967cc1d62a430cebd634b5046.tar.xz
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bpf: wire in data and data_end for cls_act_bpf
allow cls_bpf and act_bpf programs access skb->data and skb->data_end pointers. The bpf helpers that change skb->data need to update data_end pointer as well. The verifier checks that programs always reload data, data_end pointers after calls to such bpf helpers. We cannot add 'data_end' pointer to struct qdisc_skb_cb directly, since it's embedded as-is by infiniband ipoib, so wrapper struct is needed. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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